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Continuous wave reflectivity spectrum (open circles) at normal incidence of sample with a resolution of . The resonance of the -cavity can clearly be seen at (see inset). The solid curve is a transfer matrix calculation that includes the dispersion and absorption of GaAs and AlAs.
(Color online) (a) Differential reflectivity vs probe delay at a wavelength close to the cavity resonance measured at a different position than the cw reflectivity (Fig. 1). The width of the trough around is indicative of instantaneous probe absorption. (b) Differential reflectivity versus probe delay and wavelength. At , increases (decreases) at the blue (red) edge of the cavity, indicating a blueshift of the stopband and resonance. The black squares are the extracted cavity resonance, connected by a guide to the eye (red curve). The pump and probe energy are and , respectively.
(Color online) Differential reflectivity vs wavelength for selected probe delays. The curves are transfer matrix calculations, the vertical bars indicate the wavelengths of the cavity resonance.
(a) Carrier density vs probe delay as obtained from the differential reflectivity using the extended Drude model at delays of and longer. We have fitted a single exponential (dashed curve) to the carrier density with . (b) Change in real part and (c) imaginary part of the refractive index n calculated with the extended Drude model and the carrier density.
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